Plastics are only one kind of polymer, a substance composed of very large chain-like molecules that consist of smaller, repeating chemical units.
Natural polymers include proteins, cellulose, diamonds, and quartz.
Besides plastics, man-made ones include concrete, glass, and paper.
Shooting stars are not stars but meteorites, particles from space entering and burning up in the earth’s atmosphere.
Brass is an alloy of copper and zinc. Bronze is a more durable mixture of copper and tin.
Fingerprints provide traction for your fingers, helping you to grasp things.
Most men’s bodies are composed of about 40 percent muscle. Women’s bodies are 30 percent muscle.
The highest was 136.4 degrees Fahrenheit at El Azizia, Libya, on September 13, 1922. The lowest was –129 degrees Fahrenheit at Vostok, Antarctica, on July 21, 1983.
In our galaxy alone, there are about 100 billion stars. In the universe that we can see, the number of stars is estimated at 10^22.